you need to air up to recommended PSI when towing IMO

unloaded you can chalk it Proper Tire Inflation

 

They're a 65psi Max tire. I will do a chalk test tomorrow just was hoping someone with the same tire/truck combo could chime in to make life a little easier.

 

i have run mine 37x13.50x18 around about 45 rear 50 front and it rides softer but it seemed like fuel mpg start to suffer due to rolling resistance

 

I would start around 45 front and 35 rear when empty. Boat sounds pretty light so you should be good for shorter trips. For longer trips at highway speeds up the rears to 40-45 psi. Obviously for really big loads (1500lb+ tongue weight or loads in the bed) I would go higher.

 

Wow that's crazy. Tire shop has them set at 62 psi right now. The ride is good but I feel it will be better once I let some air out. Will do the chalk test today for sure.

 

Slide a credit card under the edge of the tread, deflate until only a 1/4" of the card can slide under the tread. Old school method.

Skyd Ram is pretty smart. On my 37" tires with 17" rims I run 45 front and 35 in the rear. I even tow like that. I should add air when towing but it is a hassle.

 

Run My 37x13.5x22's at 55psi